Hi, 
firstly i have  little if any experience on the mitel phone platform so apologies if my question seems trivial. 
I have department serveral users that are currently complaining that when customers call and they are either on the phone or away from desk or in dnd.
the caller recieves a out of service recorded message. 
was wondering how i can set up call the phone system to route the caller back into the hunt group number 529
example extenstions 
111
222
333
444
555
666
*777
*777 = manager extention. ( would ideally like calls to fall through to him/her if no one picks or is busy /dnd. 
any help guidance appreciated.